ANSWER: Three
EXPLANATION: Scott Joplin's Solace: A Mexican Serenade has three sections. It starts with an introduction and is followed by three sections. Each section repeats in the format AABBACC. It is very prevalent, specifically in sections A and B.
5 doesn't have the same variable. You can't add two terms that have different variables. Ex. : 3g+2f+5 cannot be added together.
